B公式B( 1/2 , 1/4 ) = 2ω B( 1/2 , 3/4 ) = 2A.G.M.( 1 , √2 ) B( p , q ) = ( p+q+r-1Pr/q+r-1Pr )B( p , q+r ) B( 1 , -q ) = 1/( -q ) B( p , -q ) = ( p-1 )!/Π( m-q ) ( m = 0 , 1 , 2 , 3 , ・・・ , p-1 )